(217) بَابُ الرِّفْقِ
Anas reported that the Prophet, may Allah bless him and grant himpeace, said, "If there is roughness in anything it is bound to disgraceit. Allah is compassionate and loves compassion."
Reference: Al-Adab Al-Mufrad 466
In-book reference: Book 26, Hadith 5
English translation: Book 26, Hadith 466